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arturjanc's profile
Artur Janc
Artur Janc
Artur Janc
@arturjanc

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Artur Janc

@arturjanc

Making the web platform more secure one Twitter flamewar at a time.

Zurich, Switzerland
Joined February 2012

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    1. Intent To Ship‏ @intenttoship 5 Oct 2017

      Blink: Intent to Implement and Ship: 'unsafe-hashed-attributes' in CSP3https://groups.google.com/a/chromium.org/d/msg/blink-dev/bUAhkdsrmqE/nimnFDG3BAAJ …

      2 replies 5 retweets 5 likes
    2. Sebastian Lekies‏ @slekies 5 Oct 2017
      Replying to @intenttoship

      Another 'unsafe-' keyword :-(. What's the rationale for this? Does this enable use cases that aren't possible with standard CSP & JS?

      1 reply 2 retweets 2 likes
    3. Mike West‏ @mikewest 5 Oct 2017
      Replying to @slekies @intenttoship

      Talk to @arturjanc.

      2 replies 0 retweets 0 likes
      Artur Janc‏ @arturjanc 5 Oct 2017
      Replying to @mikewest @slekies @intenttoship

      Yes, it lets apps with lots of static HTML add CSP which will allow existing inline scripts to run, while preventing arbitrary JS execution.

      9:57 AM - 5 Oct 2017
      • 3 Likes
      • Ives Laaf Bob Aman superspooktacular isogenies
      1 reply 0 retweets 3 likes
        1. New conversation
        2. Sebastian Lekies‏ @slekies 5 Oct 2017
          Replying to @arturjanc @mikewest @intenttoship

          It also enables new CSRF-like XSS attacks. Developers will use it because its easier than rewriting. Not sure if this is a good idea.

          1 reply 0 retweets 4 likes
        3. Sebastian Lekies‏ @slekies 5 Oct 2017
          Replying to @slekies @arturjanc and

          Do pages whitelist handlers on a per-page basis or do you think there will be one policy containing all handlers of an app?

          1 reply 0 retweets 1 like
        4. Sebastian Lekies‏ @slekies 5 Oct 2017
          Replying to @slekies @arturjanc and

          Also is the attribute name part of the hash?

          1 reply 0 retweets 1 like
        5. Artur Janc‏ @arturjanc 5 Oct 2017
          Replying to @slekies @mikewest @intenttoship

          It's likely going to be a per-page policy generated automatically by middleware for static HTML, allowing only scripts from the current doc.

          1 reply 0 retweets 1 like
        6. Artur Janc‏ @arturjanc 5 Oct 2017
          Replying to @arturjanc @slekies and

          One of the proposals was to include event handler names, but this seems more complicated for little benefit so I'd prefer to avoid it.

          2 replies 0 retweets 1 like
        7. Sebastian Lekies‏ @slekies 5 Oct 2017
          Replying to @arturjanc @mikewest @intenttoship

          It would disable a lot of the code-reuse attack vectors.

          1 reply 0 retweets 1 like
        8. Artur Janc‏ @arturjanc 5 Oct 2017
          Replying to @slekies @mikewest @intenttoship

          For common EHs like onclick, onload, onmouse* this seems tough b/c the attacker controls the DOM and can dupe the user into causing events.

          1 reply 0 retweets 1 like
        9. Sebastian Lekies‏ @slekies 5 Oct 2017
          Replying to @arturjanc @mikewest @intenttoship

          Yes, but it prevents the attacker from reusing an onclick handler in an onload handler.

          1 reply 0 retweets 1 like
        10. 9 more replies

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